29
GUJARAT TECHNOLOGICAL UNIVERSITY
BASIC ELECTRONICS (Modified Version January 2014)
SUBJECT CODE: 2110016
B.E. 1st YEAR
Type of course: Basic
Prerequisite: N.A.
Rationale: N.A.
Teaching and Examination Scheme:
Teaching Scheme Credits Examination Marks Total
Marks L T P C Theory Marks Practical Marks
ESE
(E)
PA
(M)
ESE
Viva (V)
PA
(I)
4 0 2 6 70 30* 30# 20** 150
L- Lectures; T- Tutorial/Teacher Guided Student Activity; P- Practical; C- Credit; ESE- End
Semester Examination; PA- Progressive Assessment
Content:
Sr. No. Topic Teaching
Hrs.
1
Circuit Concepts
Electrical Quantities
Lumped Circuit Elements
Kirchhoff’s Laws
Meters and Measurements
Analogy between Electrical and other Non-Electrical Physical
Systems
A case study
6
2
Circuit Analysis Techniques:
Thevenin and Norton Equivalent Circuits
Node-Voltage and Mesh-Current Analysis
Superposition and Linearity
Wye-Delta Transformation
Computer Aided Circuit Analysis
A Case Study
8
3
Analog Building Blocks and Operational Amplifiers Basic ideas
The Amplifier Block
Ideal Operational Amplifier
Practical Properties of Operational Amplifiers
Applications of Operational Amplifiers
A case study
8
4 Digital Building Blocks
Digital System Building Blocks 8
Digital System Components
Computer Systems
Computer Networks
A case study
5
Signal Processing:
Signals and Spectral Analysis
Modulation, Sampling and Multiplexing
Interference and Noise
A case Study
8
6
Communication Systems
Waves, Transmission Lines, waveguides and Antenna
Fundamentals
Analog Communication Systems
Digital Communication Systems
A Case Study
6
7
Basic Control Systems
Feedback Control Systems
Digital Control Systems
A Case Study
6
Reference Books:
1. Introduction to Electrical Engineering, M S Sarma, Oxford University Press
Course Outcome:
After completion of the course, the student will be able to –
Determine the behavior of simple passive electrical circuits with independent voltage and
current sources.
Design simple analog signal processing functions using operational amplifiers.
Design simple combinational and sequential functions using gates and flip-flops.
Explain the functioning of digital system components including DACs, ADCs, memory and
display devices,
Explain the organization of computer systems and computer networks.
Determine the properties of simple signal processing systems.
Determine the behavior of analog and digital communication systems.
Determine the behavior of simple linear feedback control systems
List of Experiments:
The practical/exercises should be properly designed and implemented with an attempt to develop
different types of skills so that students are able to acquire the competency. Following is the list of
experiments for guidance. A student should perform at least 10 experiments out of the given 14 with
at least one experiment from each Unit
S. No. Unit
No.
Practical/Exercise Apprx.
Hrs.
Required
1 I a. Observe the behavior of RLC circuits with ideal and
non-ideal voltage sources and current sources.
b. Verify Thevenin’s and Norton’s Theorems
2
2 II Simulate passive electrical circuits using Multisim
simulator and compare the simulated response with that
of the actual circuit
2
3 III Determine the parameters of three commercial Op
Amps
2
4 III Perform simple analog signal processing functions
using Op Amps
2
5 IV Design simple combinational functions as per
specifications and verify the correctness of your design
2
6 IV Design simple sequential functions as per specifications
and verify the correctness of your design
2
7 IV Measure the characteristics of given DACs and ADCs 2
8 V Simulate simple modulation, sampling, multiplexing,
demodulation signal processing functions Multisim
2
9 V Simulate simple filtering signal processing function
Multisim
2
10 V Measure the performance of a given signal processing
system
2
11 VI Determine the behavior of a given analog
communication system through simulation using
Multisim
2
12 VI Determine the behavior of a given digital
communication system through simulation using
Multisim
2
13 VII Determine the behavior of a second and third order
control systems through simulation using Multisim
2
14 VII Determine the behavior of a practical control system
using ON-OFF and P controllers through simulation
using SciLab
Determine the behavior of a practical control system
using PI and PID controllers through simulation using
SciLab
2
Open Ended Problems:
1. Most of the electronic system and instruments operates with DC power. The student can be
given a project a design a miniature regulated dc power supply, battery eliminator or charger
for electronic devices, circuits and systems. The project can be given with modification to
display the voltage and current on seven segments LED or LCD. There can be several
designs for such projects. The project can be extended for multiple voltages those may be
needed for various applications such as for op-amp based circuits. Different student group
may be provided with different voltage and current specifications for the dc power supply.
Note: This project can be divided into several parts.
2. The electronic counter can be interesting circuit to design. The students may be asked to
design counter to count occurrence of events or objects. They may be asked to design from 2
to 4 digits. The project may need understanding of sensor and transducer as well as signal
conditioning circuits. The project may extend to design digital clock.
3. The design of fastest finger first circuit. This project may be given for several inputs. It can
be learning with fun. The students will learn about different switches and their operations.
The interfacing with digital and analog circuits.
4. The design of oscillator circuits electronic oscillators are important circuits to be used for
various applications. Students can explore analog and digital integrated circuits for design of
oscillators of different frequencies and amplitude. This may extended for design of signal
generators.
5. The design of water level indicator and controller may be given to students. In this case
student can learn various types of level sensing mechanism and simple on-off control
scheme implemented using analog electronic or digital electronic circuits.
6. Design a simple electronic circuit whose output voltage varies with temperature and light.
Major Equipment’s:
(1) CRO (At least 20MHz)
(2) Function Generator (Frequency range up to 20 MHz) – need to have sine, square wave
output.
(3) Dual Power Supply (0-12V/15V DC)/3A
(4) Micrometers for measurement of voltage and current with suitable ranges.
(5) Multimeter
(6) Various Electronics Components including different types of Op Amps and digital ICs.
(7) PCs
List of Open Source Software/learning website:
Software: Multisim and SciLab (www.scilab.org)
Learning Material: http://nptel.iitm.ac.in/. www.spoken-tutotial.org
*PA (M): 10 marks for Active Learning Assignments, 20 marks for other methods of PA;
ACTIVE LEARNING ASSIGNMENTS: Students will prepare power-point slides, which include
videos, animations, pictures, graphics for better understanding theory and practical work – The
faculty will allocate chapters/ parts of chapters to groups of students so that the entire syllabus of
Basic Electronics is covered. The power-point slides should be put up on the web-site of the
College/ Institute, along with the names of the students of the group, the name of the faculty,
Department and College on the first slide. The best three works should be sent to
**PA (I): 10 marks for a case study of Systems, 10 marks for other methods of PA
PA (I): The faculty may also allocate additional marks out of PA for Practical Work, in addition to
the regular practicals. This work may be as follows:
(i) Practical work planned by students, with the approval/ guidance of the students.
(j) Preparation of a case study on a present day electronic system of choice.
# ESE Pr (V):10 marks for Open Ended Problems, 20 marks for VIVA.
Note: Passing marks for PA (M) will be 12 out of 30.
Passing marks for ESE Pract(V) will be 15 out of 30.
Passing marks for PA (I) will be 15 out of 30
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–1/2 (NEW) EXAMINATION – WINTER 2017
Subject Code: 2110016 Date: 04/01/2018 Subject Name: Basic Electronics Time: 10:30 AM TO 01:00 PM Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions. 1. Make suitable assumptions wherever necessary. 2. Figures to the right indicate full marks.
Q.1 (a) FILLED THE BLANKS WITH APPROPRIATE WORDS 07
1. Just as differential Equation are used to represent systems with analog
signals,____________ are used for systems with discrete or digital data.
2. The existence of transients and associated oscillations are a characteristic of
systems possesses _____________.and that is subjected to disturbances.
3. To minimize coupling from the inevitable sources, all exposed elements are
usually enclosed with in ______________, which offer low resistances paths to
ground.
4. Slew rate is a measure of _____________ can change and it is given by
___________, with reference to OP AMP.
5. Most sequential blocks are of the kind known as _________, which can
be__________ or________or______________.
6. In order to measure the potential difference between two terminals or node of
circuit, voltmeter is connected _____________ these two points.
7. Mathematically function is said to be linear if it satisfies two properties:
__________ and ____________.
(b) STATE TRUE OR FALSE WITH PROPER JUSTIFICATION 07
1. Materials through which charge flows readily are called insulators.
2. Reciprocal of resistance is called as conductance.
3. Node analysis is used KCL to formulate circuit equation.
4. Ideal amplifier has infinite input Impedance and zero output Impedance.
5. For JK flip flop, when both input are 1(one) state, output is Indeterminate state.
6. Multiplexing system is one in which two or more signals are transmitted
differently for the transmission channel.
7. The transfer function is Independent of Input signal.
Q.2 (a) Draw the various rules to reduce/modification of Block Diagram system. 03
(b) Enlist the practical properties of OP OMP. 04
(c) Explain Node and Mesh Analysis with Controlled Sources., with example. 07
Q.3 (a) Draw the Transformer Device with associated diagrams and calculation. 03
(b) Draw the block diagram of typical digital control system. Describe the function
of each block. 04
(c)
Draw the diagram for elements of Antennas, and explain with associated
formulae and Equation. 07
Q.4 (a) Make comparison of various Analog Modulation systems, based on different
criteria. 03
(b) Classify the various ADC ckts ,with sketches and formulae. 04
(c) Classify the control system by control action. Explain with suitable example. 07
Q.5 (a) Describe the process of sampling and quantization with mathematical
formulation. 03
(b) Explain the SNR with associated waveforms and calculation. 04
(c) Draw and explain the WYE- DELTA transformation with mathematical
formulation and example. 07
Q.6 (a) Draw the frequency bands of Electromagnetic spectrum and enlist the
applications of each one for the same. 03
(b) Draw the block diagram of PCM, with associated waveforms and circuits. 04
(c) List the various application of OP AMP, with diagram and formulae. 07
Q.7 (a) Draw the typical FDM system with associated nomenclature. 03
(b) Draw the various and basic GATE name, Logic symbols and Truth table. 04
(c)
Make comparison of Digital communication systems with relative formulae and
statics.
07
***********
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE- SEMESTER 1st / 2nd EXAMINATION (NEW SYLLABUS) – SUMMER - 2017
Subject Code: 2110016 Date:02/06/2017
Subject Name: Basic Electronics
Time: 2:30 PM to 05:00 PM Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ) Mark (a) 07
1. The superposition theorem is applicable to
(a) linear, non-linear and time variant responses
(b) linear and non-linear resistors only
(c) linear responses only
(d) none of the above
2. Octal number 12 is equal to decimal number
(a) 8 (b) 9 (c) 10 (11) 11
3. Karnaugh map cannot be drawn when the number of variables is more than 4.
(a) True (b) False
4. If all the LEDs in a seven segment display are turned on, the number displayed is
(a) 1 (b) 3 (c) 0 (d) 8
5. The number of cells in a 4 variable K map is
(a) 16 (b) 8 (c) 4 (d) 32
6. δ(t) is a (a) energy signal (b) power signal (c) neither energy nor power (d) none
7. ________ is called volatile memory.
(a) ROM (b) RAM
(b) 07
1. An op-amp has very ________.
(a) high voltage gain
(b) high input impedance
(c) low output impedance
(d) all of the above
2. Which is a typical application of digital signal processing? (a) Noise elimination (b) Music signal processing (c) Image processing (d) All of the above
3. A woofer should be fed from the input through a
(a) low pass filter
(b) high pass filter
(c) band pass filter (d) band stop filter
4. A carrier wave carries information.
(a) True (b) False
5. Which of the following system has feedback network?
(a) Open loop (b) Closed loop
6. In satellite communication, frequency modulation is used because satellite channel has (a) small bandwidth and negligible noise (b) large bandwidth and severe noise (c) maximum bandwidth and minimum noise
(d) high modulation index
7. Which of the following is even signal?
(a) Cos (b) Sin (c) Signum (d) None of the above
Q.2 (a) Write down the superposition theorem. 03
(b)
(c)
State and explain Thevenin’s theorem.
Explain Kirchhoff’s Voltage law with suitable example. 04
07
Q.3 (a) Explain universal gates in detail. 03
(b)
(c)
Explain full adder circuit.
Give different types of flip fops. Explain any one flip flop in detail. 04
07
Q.4 (a) Explain current to voltage convertor. 03
(b)
(c)
Explain CMRR property of operational amplifier.
Explain the inverting amplifier application of operational amplifier. 04
07
Q.5 (a) Explain single sideband amplitude modulation (SSBAM). 03
(b)
(c)
Define: (1) Propagation mode (2) Cutoff frequency
Draw and explain Block diagram of a super heterodyne FM radio receiver. 04
07
Q.6 (a) Draw the block diagram of typical digital control system. 03
(b)
(c)
Give the classification of feedback control system.
Draw and explain functional block diagram of a signal processing system. 04
07
Q.7 (a) Briefly explain Transformer. 03
(b)
(c)
Explain how the wheatston bridge can find the unknown resistance?
Explain four bit serial in serial out shift register with block diagram and timing
diagram.
04
07
***********
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE SEMESTER 1st / 2nd (NEW) EXAMINATION WINTER 2016
Subject Code: 2110016 Date:25/01/2017
Subject Name: Basic Electronics
Time: 10:30 AM TO 1:00 PM Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ) MARKS
(a) Choose an appropriate option from the following: 07
1. In an Electrical system, the flow of current follows:
(a) De Morgan’s law (b) Boyle’s law (c)Curie’s law (d) Ohm’s law
2. The equivalent octal of the binary number (101010101011)2 is
(a) (5352)8 (b) (2523)8 (c) (5253)8 (d) (225253)8
3. X(t)= - X(t) is the property of
(a) Even signal (b) Odd signal (c)Periodic signal(d) Aperiodic signal
4. If a 1 Hz square signal is given to a bulb, how long will it glow?
(a) 1second (b) 2 second (c) 0.5 second (d) 0 second
5. The inductance offered by a inductor of 1 H to a DC signal is
(a) 0 (b) infinity (c) 1 (d) indeterminate
6. Following gates are known as Universal Logic Gates
(a) AND, OR (b) NAND, NOR (c) AND, NOR (d) NAND,OR
7. A circuit that converts AC signal to DC signal is known as a
(a) Rectifier circuit (b) Inverter circuit (c) RL circuit (d) RC circuit
(b) Choose an appropriate option from the following: 07
1. The IC 741 Operational Amplifier cannot:
(a) Add signals (b) Subtract signals (c) Transform signal (d)
Differentiate signal
2. A Flip Flop has got a memory of
(a) 1 bit (b) 2 bit (c) 4 bit (d) 8 bit
3. An operational amplifier IC 741 has got
(a) 2 inputs, 1 outputs (b) 1 inputs, 2 outputs (c) 1 input 1 output
(d)2 inputs, 2 outputs
4. Wireless mobile cells are _______________ in shape
(a) pentagon (b) hexagon (c) circular (d) square
5. A system is linear if _______ is true.
(a) KVL (b) KCL (c) Superposition theorem (d) Ohm’s law
6. PAM stands for
(a) Pulse And Modulation (b) Pulse Analog Modulation (c) Pulse
Altitude Modulation (d) Pulse Amplitude Modulation
7. A control system with feedback has
(a) maximum error (b) minimum error(c)zero error (d) infinite error
Q.2 (a) Define Resistor. Quote all the characteristics of any resistor. If you
go to the market to purchase a resistor, apart from resistance what
else will you quote so that the safety is ensured?
03
(b)
(c)
How does a Voltmeter differ from an Ammeter?
What is Superposition Theorem? Prove the same for a network. 04
07
Q.3 (a) Draw an inverting amplifier and write the equation for its gain. 03
(b)
(c)
Show a Low Pass Filter. Define the higher frequency cutoff.
Explain the working of a band pass filter. Find out its bandwidth. 04
07
Q.4 (a) Assign a binary code to all the 52 playing cards. Use minimum
number of bits. 03
(b)
(c)
State and Prove De Morgan’s laws. Design an Op-amp based circuit that does the following VO=V1-2*V2.
04
07
Q.5 (a) Draw an SR Flip Flop. Plot its truth table and Symbol. 03
(b)
(c)
Draw the block diagram of a multiplexer circuit and label the pins.
How does a PAM signal differ from a PWM, PPM signal? 04
07
Q.6 (a) Draw the ISO- 7 layer block diagram for Computer Network 03
(b)
(c)
Define Antenna, Waveguide, Transmission Lines and Flux density.
Draw the block diagram of a Communication system. Explain each
block.
04
07
Q.7 (a) Define a control system. Classify them and state their advantages. 03
(b)
(c)
Explain Frequency Reuse in Cellular Communication
Discuss the types of Computer Networks. 04
07
***********
Seat No.: ________ Enrollment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER– 1st / 2nd EXAMINATION (NEW SYLLABUS) – SUMMER 2016
Subject Code: 2110016 Date:03/06/2016
Subject Name: Basic Electronics
Time: 02:30 PM to 5:00 PM Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ)
(a) Choose an appropriate option from the following. 07
1. Power is defined as the rate of transfer of _______with respect to
time.
(a) Charge (b) Current (c) Energy (d) Voltage
2. Mesh analysis is based on
(a) KVL (b) KCL (c) Both (d) Law of conversion of energy
3. If the network elements such as resistances, capacitances,
inductances are not physically separable, then it is known as
(a) Lumped Network (b) Distributed Network
(c) Unilateral Network (d) Bilateral Network
4. Which of the following is not applicable to the nonlinear network?
(a) Thevenin (b) Norton (c) Superposition (d) KCL
5. For Non inverting amplifier the phase shift between input and
output is
(a) 270° (b) 45° (c) 180° (d) 0°
6. Which one is Linear Application of Op-Amp?
(a) Comparator (b) Differentiator
(c) Schmitt trigger (d) Log Amplifier
7. The decimal equivalent of Binary (1111110) is
(a) 125 (b) 128 (c) 255 (d) 126
(b) Choose an appropriate option from the following. 07
1. The Digital Circuit which accepts many input and produces only
one output is known as
(a) Encoder (d) Demultiplexer (c) Multiplexer (d) Decoder
2. Out of following signal,_______ is a Random Signal.
(a) Sine Wave (b) Cosine Wave (c) Noise (d) Triangle Wave
3. The antisymmetrical signal is also known as ________ Signal.
(a) Even (b) Odd (c) Energy (d) Power
4. Out of following ________ is digital Pulse Modulation.
(a) PAM (b) PPM (c) PCM (d) PWM
5. AM Radio broadcasting utilizes a frequency band
(a) 30kHz-300kHz (b) 300kHz-3MHz
(c) 30Hz-300Hz (d) 30MHz-300MHz
6. Which of the following is used for AM Detection
(a) Slope detector (b) Zero Crossing detector
(c) Envelope detector (d) Phase locked loop
7. If r(t) is input, c(t) is the output and G(s) is the transfer function,
then for an impulse input
(a) G(s)=C(s) (b) G(s)=R(s)C(s)
(c) G(s)=R(s) (d) G(s)=0
Q.2 (a) Explain Coulomb’s First and Second Law. 03
(b)
(c)
Explain Kirchhoff’s Voltage law and Current law in Short.
Explain Thevenin’s theorem with suitable Example.
04
07
Q.3 (a) Give the Classification of Electric Network. 03
(b)
(c)
Draw the logic symbol and truth table of following gates.
1. AND 2. OR 3. EX-OR 4. NOR
Write short note on JK flip flop with logic diagram and truth table.
04
07
Q.4 (a) Reduce the given Boolean expression using K-map.
F(A,B,C) = ∑m(0,2,3,5)
03
(b)
(c)
Write short note on Star topology.
Explain ideal characteristics of ideal Op-Amp in detail.
04
07
Q.5 (a) Give the classification of signals. 03
(b)
(c)
Explain inverting configuration of Op-Amp.
Draw and explain basic elements of digital communication system.
04
07
Q.6 (a) What is multiplexing? Compare FDM and TDM 03
(b)
(c)
Write short note on Waveguides.
Draw and explain the block diagram of superheterodyne AM radio
receiver.
04
07
Q.7 (a) Compare Open Loop and Closed Loop Systems. 03
(b)
(c)
Explain transient response and steady state response of system with
diagram.
Explain any seven rules for block diagram reduction of control
system with necessary diagram.
04
07
***********
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER– 1st / 2nd EXAMINATION (NEW SYLLABUS) – SUMMER 2015
Subject Code: 2110016 Date: 09/06/2015
Subject Name: BASIC ELECTRONICS
Time: 10.30am-01.00pm Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ)
(a) Choose an appropriate option from the following. 07
1. The frequency that has the longest period is
(a) 10 KHz (b) 1 KHz (c) 10 Hz (d) 1 Hz
2. Ohm’s law (V = IR)
(a) Can be applied to a.c similar to that of d.c.
(b) Can be applied to a.c. but after replacing R by Z (impedance)
(c) Can never be applied to a.c
(d) None of the above
3. The difference in period of two frequencies of 1MHz and 2 MHz is
(a) 0.5 milli-seconds (b) 0.5 micro-seconds
(c) 1 milli-seconds (d) 1 micro-seconds
4. Conductance is expressed in terms of
(a) ohm / m (b) m / ohm (c) mho / m (d) mho.
5. Which resistor will be physically larger in size ?
(a)10 ohm, 50 W (b) 100 ohm, 10 W
(c) 1 kohm, 1 W (d) 10 Mohm, 1/ 2 W.
6. The output of a logic gate is ‘1’ when all its input are at logic 0.The gate is either
(a) NAND or an EX OR gate (b) NOR or an EX-NOR gate
(c) an OR or an EX NOR gate (d) an AND or an EX-OR gate
7. Out of following signals __________ is an even signal.
(a) Cosine wave (b) Sine wave
(c) Triangle wave (d) None of the above.
(b) Choose an appropriate option from the following. 07
1. The circuit which magnifies a small input signal without changing its shape is
called an ____________
(a) Linear amplifier (b) Power Amplifier
(c) Non-linear Amplifier (d) None of Above
2. IC741 use a ________ polarity supply.
(a) Dual (b) Single (c) Negative (d) None of Above
3. Minimum bandwidth of an AM wave is ________.
(a) fm (b) 2fm (c) 0.5fm (d) 4fm
4. PCM is a _________Pulse Modulation Technique.
(a) Analog (b) Digital (c) Hybrid (d) None of Above
5. The first cellular systems were ___________.
(a) Analog (b) Digital (c) Hybrid (d) None of Above
6. A feedback control system is also called a___________.
(a) Recursive system (b) Linear System.
(c) Open loop system (d) Closed loop system.
7. CPU communicates with the outside world through the ________.
(a) Memory (b) I/O devices (c) ALU (d) None of Above
Q.2 (a) Define The following Terms.
(a) Interference (b) Mutual Inductance (c) Noise Margin
03
(b) Write a short note on Cathode Ray Oscilloscope. 04
(c) Find the voltage Vx using superposition theorem. All resistor values are in ohm.
07
Q.3 (a) Draw circuit diagram of non-inverting operational amplifier & explain in brief. 03
(b) Explain DELTA-WYE transformation in brief with necessary equations and circuit
diagrams.
04
(c) Describe low pass active filter using Operational amplifier with necessary
diagrams and equations.
07
Q.4 (a) What is difference between in Microprocessor and Microcontroller? 03
(b)
What do you understand about multiplexing? Explain any one of the Multiplexing
technique.
04
(c) Draw & Explain the functional description of digital communication system in
brief.
07
Q.5 (a) Reduce the given function using K-map, F=m(1,3,5,9,11,13) 03
(b) Write Short note on D flip flop with circuit diagram and truth table. 04 (c) Classify the types of Computer network? Explain each one of them in brief. 07
Q.6 (a) What do you understand about isotropic radiator? 03
(b) Classify the standard based on 2G & 3G. 04
(c) What do you understand about frequency reuse concept & Why it is used in
cellular system?
07
Q.7 (a) Classify the Control systems. 03
(b) Compare Open loop and Close loop System. 04
(c) Compare DSB-FC, DSB-SC, SSB, VSB. 07
***********
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–I & II (NEW) EXAMINATION – WINTER 2015
Subject Code: 2110016 Date:29/12/2015
Subject Name: Basic Electronics
Time: 10:30am to 01:00pm Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining Six questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Question (MCQ)
(a) 07
1. Which component has a positive and a negative side?
(a) A potentiometer (b) A fuse (c) A resistor (d) A battery
2. To increase the current capacity of a cell, several cells should be connected in:
(a) parallel (b) series (c) parallel resonant (d) series resonant
3. Which tolerance rating would a high-quality resistor have?
(a) 5% (b) 10% (c) 20% (d) 0.1%
4. What does a common multimeter measure?
(a) Resistance, capacitance and inductance (b) Voltage, current and resistance
(c) Resistance and reactance (d) SWR and power
5. Potential difference is measured by means of:
(a) a wattmeter (b) an ohmmeter (c) a voltmeter (d) an ammeter
6. A resistor in a circuit becomes very hot and starts to burn. This is because the
resistor is dissipating too much:
(a) voltage (b) resistance (c) current (d) power
7. In most of modern IC op-amps, the 741 requires _____ power supplies
(a) 1 (b) 2 (c) 3 (d) 4
(b) 07
1. Electrical energy at a frequency of 1454 Hz is in what frequency range?
(a) Radio (b) Audio (c) High (d) Super-high
2. A circuit designed to increase the level of its input signal is called:
(a) an amplifier (b) a modulator (c) an oscillator (d) a receiver
3. In a frequency modulation receiver, the __________ is in between the antenna and
the mixer.
(a) audio frequency amplifier (b) high frequency oscillator
(c) intermediate frequency amplifier (d) radio frequency amplifier
4. All arithmetic operation take place in the _____ of a computer
(a) CPU (b) ALU (c) ROM (d)Microprocessor
5. The logic gate which detects equality of two bits is
(a) EX-OR (b) EX-NOR (c) NOR (d) NAND
6. The basic building block for a logical circuit is _____
(a) A flip flop (b) A logical gate
(c) An Adder (d) None of the above
7. A control system in which the control action is somehow dependent on the output is
known as
(a) closed loop System (b) semi closed loop system
(c) open system (d) None of the above
Q.2 (a) Explain in brief about Dot Convention. 03
(b)
(c)
Write a short note on Oscilloscope.
For the circuit shown in following figure, use the superposition theorem to find io.
04
07
Q.3 (a)
(b)
Classify the controlled source and draw schematics for each.
Explain in brief following properties of operational amplifier.
(a) Input Resistance (b) Open Loop Voltage gain
(c) CMRR (d) Input Offset Voltage
03
04
(c) Write about ideal operational amplifier with necessary circuit diagram and equations. 07
Q.4 (a) Why differential amplifier is necessary? 03
(b)
(c)
Obtain a minimum Boolean expression for
F(A,B,C,D) = mi ((1, 3, 4, 5, 6, 7, 10, 12)
For the logic expression
(i) Obtain the truth table.
(ii) Name the operation performed
(iii) Realize this operation using AND, OR, NOT gates
(iv) Realize Same operation using only NAND gates
04
07
Q.5 (a) Classify display devices. 03
(b)
(c)
Classify network topologies and draw each one of them.
Draw and explain microprocessor system architecture. 04
07
Q.6 (a) Draw block diagram of Pulse code Modulation. 03
(b)
(c)
Explain in brief cellular concept in mobile radio system.
State the need of modulation and what are the other advantages of modulation in
communication system?
04
07
Q.7 (a) Define the following terms:
(a) Reflection (b) Directivity (c) Isotropic Radiator 03
(b)
(c)
What is transmission medium? What are the different types of transmission
medium?
Explain digital control system with necessary block diagrams.
04
07
***********
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–III • EXAMINATION – WINTER • 2014
Subject Code: 131101 Date: 20-12-2014 Subject Name: Basic Electronics Time: 02.30 pm - 05.00 pm Total Marks: 70 Instructions:
1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.
Q.1 (a) Explain in brief the following:
(i) Diffusion Length (ii) Conversion Efficiency (iii) Voltage Stability Factor (iv) Peak Inverse Voltage (v) Critical wavelength (vi) Pinch off Voltage (vii) Base Spreading Resistance
07
(b) Explain in detail the energy band diagram of insulator, semiconductor and conductor
07
Q.2 (a) State and explain Pauli’s Exclusion Principal. 07 (b) Derive continuity equation and explain its importance. 07 OR (b) If a donor impurity is added to the extent of one atom per 108 germanium
atoms, calculate it’s resistivity at 300ok. If it’s resistivity without addition of impurity is 44.64 Ω-cm,comparing two values, comment on result. Ge atom per cm3 is 4.4×1022 and µn = 3800 cm2/V-sec.
07
Q.3 (a) Draw switching waveform of diode and explain following terms.
a) Storage time b) Transition time c) Reverse recovery time 07
(b) A Ge diode has a contact potential of 0.2V, while concentration of acceptor impurity atoms is 3×1020 per m3, calculate for a reverse bias of 0.1V the width of depletion barrier. Assuming cross sectional area of the junction as 1mm2, calculate the transition capacitance value. Assume εr = 16 for Ge.
07
OR Q.3 (a) (i) Explain peace wise linear diode model
(ii) FET as Voltage Variable Resistor. 03 04
(b) What is the purpose of filter? Explain capacitor filter with waveforms. 07
Q.4 (a) Draw CE transistor configuration and give its input and output characteristics. Also derive the relation between current gain of CE, CB and CC configurations.
07
(b) Explain thermal runaway and derive the condition for thermal stability. 07 OR
Q.4 (a) For circuit of Figure No - 1, calculate the minimum and maximum value of emitter current when β of transistor varies from 75 to 150. Also calculate the corresponding values of collector to emitter voltage. Take VBE = 0.3V, Rb=10kΩ, Rc= 50 Ω , Re= 100 Ω, Vcc= +6V.
07
(b) Explain compensation techniques related with transistor biasing. 07 Q.5 (a) State and prove Miller’s theorem and its dual. 07
2
(b) Describe briefly the construction and working of p channel Enhancement MOSFET. Draw its characteristic and transfer curve.
07
OR Q.5 (a) Draw class B push-pull system and derive maximum conversion efficiency (η). 07
(b) (i) Compare Load Regulation and Line Regulation (ii) Figure -2 shows a basic CE amplifier. If Rs=100Ω and RL=4kΩ , determine AVS, AIS, Ri, and Ro. Use hie=1100Ω, hre=2.5×10-4, hfe=50 and hoe=1/40kΩ.
03 04
RE100 ohm
6V
RB
10k ohm
0
RC50 ohm
Figure No. -1
•
Figure No. -2
3
*************
Seat No.: ________ Enrolment No._______
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER– 1
st / 2
nd • EXAMINATION – SUMMER • 2014
Subject Code: 2110016 Date: 25-06-2014
Subject Name: Basic Electronics
Time: 02:30 pm - 05:00 pm Total Marks: 70 Instructions:
1. Question No. 1 is compulsory. Attempt any four out of remaining six questions. 2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 Objective Questions
Choose an appropriate option from the following. 14
1. In hydraulic system, Quantity named Flow is described as a Output flow rate
Fo , and in electrical quantity it is described as a________.
(a) Voltage , (b) Current, (c) Capacitance, (d) Inductance
2. To find the linearity of the circuit network which theorem is used?
(a) KCL, (b) KVL, (c) Superposition, (d) Maximum Power Transfer
3. For the operational amplifier with inverting configuration the change in the
phase of the output voltage is __________.
(a) 180o, (b) 90
o,(c) 270
o, (d) 45
o
4. Which one is the Linear application design by Op-amp ?
(a) Integrator, (b) Voltage Regulator, (c) Multiplier, (d) Comparator
5. The equivalent Decimal of the BCD (001110001001)BCD is________.
(a) (388)10, (b) (386)10, (c) (380)10, (d) (389)10
6. Which are the logic gates kwon as a Universal Gates?
(a) XOR, AND, (b) AND, OR, (c) NAND, NOR, (d) XNOR,OR
7. By using which theorem we can replace the whole circuit network in single
voltage and resistor network?
(a) Superposition, (b) Maximum power Transfer, (c) Norton’s Theorem,
(d) Thevenin’s Theroem
8. In the given pulse modulations, which one is not the type of pulse
modulation?
(a) PWM, (b) PSK, (c) PPM, (d) PAM
9. Even signals are stratify the property for signal x(t)=_______.
(a) x(-t), (b) -x(t),(c) -x(t)/4, (d) -x(t)/2
10. A radio station transmitting AM wave with 1 MHz frequency band having a
wavelength of ________.
(a) 3 meter, (b) 300 meter, (c) 0.3 meter, (d) 30 meter
11. Commercial FM radio broadcasting utilizes a frequency band ______.
(a) 90 MHz to 110 MHz, (b) 70 MHz to 120MHz, (c) 110 MHz to
180MHz, (d) 88MHz to 108MHz
12. In Which process Sampling is used?
(a) Frequency Division, (b) Signal amplification, (c) Signal attenuation,
(d) Digital Modulation
13. Feedback control system in which the control action is dependent upon the
________.
(a) Input, (b) Output, (c) Compactness, (d) Cost of System.
14. For the unit step response of the control system, rise time is given by the value
from _____of its final value.
(a) 10% to 90%, (b) 20% to 99 %, (c)10 % to 80% , (d) 30% to 100%.
Q.2 (a) Explain in brief about Lumped circuit elements called resistor and capacitor. 07
(b) (1) Write a short note on Ammeter and Voltmeter. 04
(2) Explain WYE-DELTA transformation in brief with necessary equations and
circuit diagrams. 03
Q.3 (a) Determine the voltage across the 20 Ohm resistor in the following circuit of
Figure.(a) with the application of superposition theorem.
Figure.(a)
07
(b) Write about Differential amplifier using Op-amp with necessary circuit
diagram and equations. 07
Q.4 (a) Describe band pass active filter using Operational amplifier with necessary
diagrams and equations. 07
(b) (1) For the switching function F = A(A’+B), draw a corresponding set of logic
blocks and write the truth table. 03
(2) Reduce the given function using K-map. F(A,B,C,D) =
∑mi (1,3,5,7,8,9,13,14). 04
Q.5 (a) (1) Write Short note on SR flip flop with circuit diagram and truth table. 03
(2) Draw only ISO-7 layer model block diagram of an OSI for computer
Networks. 04
(b) Explain in detail Pulse modulation with necessary diagrams. 07
Q.6 (a) (1) Draw only functional block diagram of signal processing system. 03
(2) Explain in brief Product Modulation and Demodulation with necessary
diagrams. 04
(b) Write short not on Cellular communication system. 07
Q.7 (a) (1) Define Waveguide, Transmission lines and Antenna. 03
(2) Explain any four rules of Block diagram reduction for control system with
necessary block diagrams. 04
(b) (1) Draw and explain the typical unit step response (Transient Response) of the
control system. 07
*****************
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–III • EXAMINATION – WINTER 2013
Subject Code: 131101 Date: 03-12-2013
Subject Name: Basic Electronics
Time: 02.30 pm - 05.00 pm Total Marks: 70 Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Answer the following:
(i) Write electronic configuration for Si 14
, Ge 32
(ii) Draw symbol and V- I characteristic of tunnel diode.
(iii) Define Peak Inverse voltage. State the PIV of Half wave and Full wave
rectifier.
(iv) Define the amplification factor μ of an FET.
(v) Define the thermal resistance. State the condition for the thermal stability.
(vi) Compare V-I characteristics of Silicon and Germanium p-n junction diode.
(vii) Write the Ebers –Moll equations. Sketch the circuit model which
satisfies these equations.
07
(b) Draw the circuit diagram of full wave rectifier and give its input and output
wave forms. Also derive the expression for the d.c. current.( IL d.c). 07
Q.2 (a) Draw the circuit of transistor in CE configuration. Sketch the output
characteristics. Indicate the active, saturation and cutoff regions.
07
(b) Explain the mobility and conductivity using electron-gas theory. Also derive
the expression of current density. 07
OR
(b) Define and Derive the relation between and 07
Q.3 (a) Derive the equation of the output admittance (Yo) and current gain AI for the
transistor .
07
(b) Draw the switching waveforms of diode and explain briefly.
i) storage time (tS), ii) Transition time(tt), iii) Reverse recovery time(trr) 07
OR
Q.3 (a) Explain the following diode clipping circuits with input and output waveforms.
i) Series Negative Clipper, (ii) Parallel Positive Clipper 07
(b) Calculate the stability factor S for the fixed biased circuit shown in fig 1.
07
Q.4 (a) Explain the base-width modulation (the Early effect) with aid of plots of
potential and minority concentration throughout the base region.
07
(b) Draw the block diagram of a regulated DC power supply and explain the
function of each block in it. 07
OR
Q.4 (a) Define h-parameters. Draw the h-parameter model for CE, CB and CC
configured transistor. 07
(b) Define stabilization factors S, S’ and S”. Derive the expression of S for fixed
bias transistor circuit. 07
Q.5 (a) Compare BJT and FET. Draw and explain the constructional details of JFET
and give its characteristics.
07
(b) Draw the circuit diagram of an idealized class B push-pull power amplifier.
With the help of suitable waveforms, explain its operation. 07
OR
Q.5 (a) How the FET used as a voltage-variable resistance? 07
(b)
Sketch the small- signal high frequency model of a CS amplifier.
For the series clipper circuit shown in Fig.2, draw the output voltage
waveforms and its transfer characteristics..
Fig.1
Fig. 2
07
*************
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY BE - SEMESTER–III • EXAMINATION – SUMMER 2013
Subject Code: 131101 Date: 31-05-2013 Subject Name: Basic Electronics Time: 02.30 pm - 05.00 pm Total Marks: 70 Instructions:
1. Attempt all questions. 2. Make suitable assumptions wherever necessary. 3. Figures to the right indicate full marks.
Q.1 (a) Define electron volt and draw general energy band diagram for insulator,
semiconductor, and metal. 07
(b) State Bohr’s postulates and derive expression for energy levels of electrons in Joules as a function orbit number surrounding nucleus.
07
Q.2 (a) Explain the term mobility related to charged carriers and derive expression for point form of Ohm’s law.
07
(b) Describe phenomenon of Hall effect with mathematical derivations. What are the different applications of Hall effect?
07
OR (b) Obtain expression for potential difference across a semiconductor with non-
uniform (graded) doping. Using the same, derive an expression for potential difference across open-circuited step-graded p-n junction.
07
Q.3 (a) Define and explain following terms related to diode: 1. Transition capacitance and 2. Diffusion capacitance.
07
(b) Draw double-diode clipper circuit which limits output voltage at two independent levels. Explain its working with necessary waveforms.
07
ORQ.3 (a) Draw diode I-V characteristic and explain diode static and dynamic
resistances. 07
(b) Explain working full-wave rectifier with necessary waveforms. Obtain expression for dc output voltage.
07
Q.4 (a) Indicate and briefly explain various current components flowing in p-n-p
transistor with forward-based emitter junction and reverse-biased collector junction.
07
(b) Define h-parameters, and draw h-parameter equivalent circuit for CE, CB and CC configured transistor.
07
OR Q.4 (a) Draw output and input characteristics for common-base configured transistor.
Explain base-width modulation (Early effect) for the same. 07
(b) Derive expression for small-signal voltage gain of emitter follower circuit in terms of h-parameters.
07
Q.5 (a) What do you understand by bias stability in transistor amplifier circuit?
Explain thermal instability of bias point for the same. 07
(b) Draw structure of n-channel JFET and explain its working. 07 OR
Q.5 (a) Draw and explain working of diode compensation circuit for VBE for self-stabilization in amplifier circuit.
07
(b) Compare FET and BJT devices. Define small-signal parameters of FET and draw low-frequency small-signal model for the same.
07
*************
